[zorro13]

First of all, a dog should never be allowed, on his own choosing, to come into the front seat and sit on a passenger like that. Keep a leash on him, if he tries to come in front, grab his leash, and tell him to back it up. I teach my dogs a back command.

I'm not a fan of dog parks and certainly any dog off leash without owner control. He should not be running up to anyone to get petted. Start controlling your dog's life here. If you must take him there, put him on a long line and control his movement, only allowing positive behaviors.

I would seek a better qualified trainer other than petsmart/petco, in my opinion. But keep in mind, you can have the best obedience trained dog and still have issues like this. The dog still has to learn the rules of everyday living and general manners. Your dog is constantly learning from you, your attitude, your tone of voice, your stature, and your movements. Never be angry in your training or direction, but matter of fact and firm, and always fair and consistent. Obedience training is needed here, and it will also make you more aware of what you're doing and not doing. He's taking more liberties and getting away with it, this is where you come in.

As for the bite on your sleeve, was your dog worked up in play mode, excited in any way, or do you really think he wanted a piece of you? I think he sounds like a nice boy, just needs some direction and leadership from you, he probably wants to please you but doesn't know how.